NOUS41 KWBC DDHHMM
PNSWSH
Technical Implementation Notice 12-12
National Weather Service Headquarters Washington DC
350 PM EST Mon Mar 12 2012
To: Subscribers:
-Family of Services
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
-NOAAPORT
-Other NWS Partners, Users and Employees
From: Tim McClung
Science Plans Branch Chief
Office of Science and Technology
Subject: Replacement of experimental 2.5-km Gridded MOS PoP/QPF
with HRMOS PoP/QPF
On Tuesday, March 13, 2012, beginning with the 1200 Coordinated
Universal Time (UTC) run, the experimental 2.5-km Global
Forecast System (GFS)-based gridded MOS probability of
precipitation (PoP) and quantitative precipitation forecasts
(QPF) will be replaced by an enhanced-resolution PoP and QPF
product (HRMOS QPF).
See the PNS soliciting comments:
Soliciting Comments on Proposed Enhancements to the Global
Forecast System (GFS)-Based Gridded MOS Product Through November
30, 2011
and TIN 12-09:
Addition of Experimental 2.5-km GFS-based Gridded MOS Guidance
for CONUS
These products will be available on the NWS FTP server in GRIB2
format. GRIB2 file names for the PoP and QPF guidance are listed
in Table 1 below. On a date to be announced, these products will
be disseminated across the Satellite Broadcast Network (SBN) and
NOAAPORT.
The experimental gridded MOS products contain guidance on a
2.5-km Lambert Conformal grid covering the same expanse as the
National Digital Forecast Database (NDFD) CONUS grid. Grids are
generated from the 0000 and 1200 UTC model runs at projections
of 1 to 7 days in advance. The improved HRMOS PoP/QPF forecasts
are based on gridded Stage IV precipitation data together with
GFS model output, and incorporate high resolution topographic
and precipitation climatology predictors. The following link
provides additional details about the enhanced-resolution HRMOS
PoP and QPF:
http://www.nws.noaa.gov/mdl/hrqpf/
These GRIB2 products are now available in the experimental area
of the National Digital Guidance Database (NDGD) on the NWS ftp
server. Forecast guidance for days 1 through 3 are available
here:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.m
osgfs/AR.conus/VP.001-003/
Forecast guidance for days 4 through 7 are available here:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.m
osgfs/AR.conus/VP.004-007/
Table 1: GRIB2 file names for each experimental 2.5-km GFS-based
PoP/QPF element
FILE NAME ELEMENT
ds.pop12.bin 12-h Probability of
Precipitation
ds.gpf12.bin 12-h Quantitative Precipitation
Amount
ds.pop06.bin 6-h Probability of
Precipitation
ds.qpf06.bin 6-h Quantitative Precipitation
Amount
The experimental 2.5-km PoP/QPF products are an addition to the
gridded MOS suite, not a replacement for the operational 5-km
PoP/QPF guidance. Customers who use the 5-km guidance over the
CONUS can continue to use these products without disruption
until all customers and systems are able to use the higher
resolution guidance.
A Web page outlining the gridded MOS guidance and the FTP server
structure is online at:
http://www.nws.noaa.gov/mdl/synop/gmos.php
For questions regarding the experimental 2.5-km gridded MOS
POP/QPF guidance for the CONUS please contact:
Jess Charba
MDL/Silver Spring, Maryland
301-713-1773, Ext. 179
Jerome.Charba@noaa.gov
or
Fred Samplatsky
MDL/Silver Spring, Maryland
301-713-0224, Ext. 105
Frederick.G.Samplatsky@noaa.gov
Links to the gridded MOS products and descriptions are online
at:
http://www.nws.noaa.gov/mdl/synop
NWS national TINs are online at:
http://www.weather.gov/os/notif.htm
$$